Display screen with a graphical user interface for a messaging application



The FIGURE is a front view of an image of a display screen with a graphical user interface for a messaging application.

The broken lines are environmental only and form no part of the claimed design. The outer rectangle in broken lines is included to show a portion of an example display screen and forms no part of the claimed design. 

CLAIM The ornamental design for a display screen with a graphical user interface for a messaging application, as shown and described. 